Improved oil for paint



. UNITED STATES PATENT OFFICE.

ROBERTS BARTHOLOW, OF CINCINNATI, OHIO.

IMPR OVED OIL FOR PAINT.

Specification forming part of Letters Patent No. 17,083, dated April 4.1865.

To all whom it may concern:

Be it known that I, ROBERTS BARTHOLOW, of Cincinnati, in the county ofHamilton, in the State of Ohio, have invented a new and improved methodof treating crudeor refined petroleum with sulphuric and nitric acids,so as to make a desirable and economical oil for mixing and combiningwith white lead, zincwhite, and other mineral paints and pigments, inlieu of linseed-oil and other paint-oils, and for other purposes; and Ido hereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying specimens, and to theletters of reference marked thereon.

The nature-of my invention consists in the manufacture, compounding, andpreparing of a new and improved oil for mixing and combining with whitelead, zinc-white, and other mineral paints and pigments, in lieu oflinseed-oil and other paint-oils, and for other purposes, from thefollowing articles, viz: crude petroleum or refined petroleum, (according to the density of the oil required to be produced,) sulphuricacid, and nitric acid, compounded and treated together in theproportions and in themanner hereinafter at large specified.

To enable others skilled in the art to make and use my invention, I willproceed to describe the method of its manufacture and preparation.

I take a vessel composed of material which will resist the action ofacids, and sufficiently capacious to contain three times the bulk of thepetroleum to be operated on, and put therein one gallon of crudepetroleum, and add thereto one-half pint of common nitric acid. I thenstir the mixture until the two articles are well incorporated together,and then add gradually to the mixture one-half pint of conr. monsulphuric acid. Then, if nitrous-acid fumes are given off, no furthersteps will be necessary; butif nitrous-acid fumes are not given off,

upon the addition of sulphuric acid, heat must be applied to the mixtureuntil nitrous-acid fumes do appear. ous ingredients employed, as tofreedom from impurities and density of the petroleum, determine thequestion as to whether nitrousacid fumes will or will not risespontaneously in any given case, and no rule can be stated beforehandbut the result will be equally good, whether the nitrous-acid fumes risespontaneously or upon the application of heat, as aforesaid. To make anoil less dense than that produced by the above process, I use refinedpetroleum instead of crude petroleum, as above.

The quantities of the respective ingredients named above are indicatedin order to show the relative proportions; but any multiples thereof maybe employed, and said relative proportions may be somewhat varied fromthe above formula without materially afiecti'ng the result.

What I claimasmy invention, and desire to secure by Letters Patent, is

The manufacture and preparation of anew and improved kind of oil formixing and compounding with white lead, zinc-white, and other mineralpaints and pigments, in lieu of linseed-oil and other paint-oils, andfor other purposes, composed of the ingredients above named, andcompounded, manufactured, and prepared in the manner and for thepurposes substantially as set forth above.

ROBERTS BARTHOLOVV.

Wi-tnesses: I. S. DODGE,

J. B. CONKLIN.

The qualities of the vari-

